heretic
//ˈhɛrətɪk//
Noun
hereticSingular
hereticsPlural
1
A person who holds beliefs that contradict the official or established doctrines of a religion, especially Christianity.
The church declared him a heretic for questioning their teachings.
2
A person who holds opinions or beliefs that differ from accepted or orthodox views, especially in politics, science, or other fields.
He was considered a heretic in the scientific community for challenging the established theory.